[Refactor] Database initialization and migration

- Code refactoring for database initialization and migration

latest version/core/util.py

@@ -2,7 +2,7 @@ import hashlib
 import os
 
 
-def md5(code):
+def md5(code: str) -> str:
     # md5加密算法
     code = code.encode()
     md5s = hashlib.md5()
@@ -12,8 +12,8 @@ def md5(code):
     return codes
 
 
-def get_file_md5(file_path):
-    # 计算文件MD5
+def get_file_md5(file_path: str) -> str:
+    '''计算文件MD5'''
     if not os.path.isfile(file_path):
         return None
     myhash = hashlib.md5()
@@ -25,3 +25,17 @@ def get_file_md5(file_path):
             myhash.update(b)
 
     return myhash.hexdigest()
+
+
+def try_rename(path: str, new_path: str) -> str:
+    '''尝试重命名文件，并尝试避免命名冲突（在后面加自增数字），返回最终路径'''
+    final_path = new_path
+    if os.path.exists(new_path):
+        i = 1
+        while os.path.exists(new_path + str(i)):
+            i += 1
+
+        final_path = new_path + str(i)
+
+    os.rename(path, final_path)
+    return final_path